A diverse sequence of well-bedded tuffaceous siltstone and sandstone (of both dacitic and andesitic provenance), pebble conglomerate, carbonaceous shale, calcareous shale-sandstone and minor limestone dominates the mine stratigraphy. These belong to the Permian Padang Tengku Formation of the Raub Group (Richardson, 1939; Lim et al, 2001). The stratigraphy strikes NS and dips to the east on a regional scale, but within the mine area it has an EW-strike and southerly dip.
The Penjom Thrust is the dominant feature controlling the distribution of ore in the Kalampong and Manik pits. This strikes NE (035°) and dips to the southeast (30-40°).